mirror of
https://github.com/macintoshplus/doc-fr.git
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166 lines
3.8 KiB
XML
166 lines
3.8 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 593ea510e853ff034e03f78a4be0daa41661c9d4 Maintainer: yannick Status: ready -->
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<!-- Reviewed: yes -->
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<refentry xml:id="function.imagecolorat" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>imagecolorat</refname>
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<refpurpose>Retourne l'index de la couleur d'un pixel donné</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type class="union"><type>int</type><type>false</type></type><methodname>imagecolorat</methodname>
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<methodparam><type>GdImage</type><parameter>image</parameter></methodparam>
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<methodparam><type>int</type><parameter>x</parameter></methodparam>
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<methodparam><type>int</type><parameter>y</parameter></methodparam>
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</methodsynopsis>
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<para>
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Retourne l'index de la couleur du pixel situé aux coordonnées spécifiées,
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dans l'image <parameter>image</parameter>.
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</para>
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<para>
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Si l'image
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est une image en TrueColor, cette fonction retourne la valeur RGB
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du pixel, sous forme d'un entier. Utiliser les opérateurs de bits et les
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masques pour distinguer le rouge, du vert et du bleu :
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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&gd.image.description;
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<varlistentry>
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<term><parameter>x</parameter></term>
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<listitem>
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<para>
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X : coordonnée du point.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>y</parameter></term>
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<listitem>
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<para>
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Y : coordonnée du point.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Retourne l'index de la couleur &return.falseforfailure;.
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</para>
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&return.falseproblem;
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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&gd.changelog.image-param;
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</tbody>
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</tgroup>
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</informaltable>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Accès aux valeurs RGB</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$im = imagecreatefrompng("php.png");
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$rgb = imagecolorat($im, 10, 15);
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$r = ($rgb >> 16) & 0xFF;
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$g = ($rgb >> 8) & 0xFF;
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$b = $rgb & 0xFF;
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var_dump($r, $g, $b);
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?>
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]]>
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</programlisting>
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&example.outputs.similar;
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<screen>
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<![CDATA[
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int(119)
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int(123)
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int(180)
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]]>
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</screen>
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</example>
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<example>
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<title>Valeurs RVB lisibles en utilisant la fonction
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<function>imagecolorsforindex</function></title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$im = imagecreatefrompng("php.png");
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$rgb = imagecolorat($im, 10, 15);
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$colors = imagecolorsforindex($im, $rgb);
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var_dump($colors);
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?>
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]]>
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</programlisting>
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&example.outputs.similar;
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<screen>
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<![CDATA[
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array(4) {
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["red"]=>
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int(119)
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["green"]=>
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int(123)
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["blue"]=>
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int(180)
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["alpha"]=>
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int(127)
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}
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]]>
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</screen>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<simplelist>
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<member><function>imagecolorset</function></member>
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<member><function>imagecolorsforindex</function></member>
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<member><function>imagesetpixel</function></member>
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</simplelist>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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